Traffic Barrier Guidelines Other Considerations

Hands-On Workshop IIIJuly 2013

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Starts at the Site Visit

AOC 1

Identify AOC’s1. Bridge Pier2. Bridge Cone3. Light Pole4. Control Cabinet5. Sign Electric Panel6. Sign Foundation7. Sign Panel8. Trees

AOC 2

AOC 3

AOC 4

AOC 5

AOC 6

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How to address the area overall?

AOC 7

AOC 8

Combining Areas of Concern Case 1

When the two AOC’s are generally at the same station, but with different offsets.

AOC 1 AOC 2

AOC further from the roadway will result in the longer length of need.

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Combining Areas of Concern Case 2

When a fixed object is located in the midst of a long slope AOC.

V

H

1: 2.5 (V:H)

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The slope AOC will control the length of need.

Barrier Installation Conflicts

Retaining Wall Conflict• Last six posts for Traffic Barrier Terminal Type T6 were omitted.

Retaining wall design and location could have eliminated the conflicts.

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Barrier Installation Conflicts

Drainage Structure Conflict:Last two posts for Traffic Barrier Terminal Type T6 were omitted.

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Traversable Element

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Traversable Element

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Barrier Clearance Distance

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Barrier Terminal Connection

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Drainage Structure Conflict

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Parapet or Concrete Barrier Contributes Toward the LON.

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AOC #1-Bridge Parapet

AOC #2-Waterway

AOC #1-LONAOC #2-LON

Bridge parapet contributes towards the shielding for AOC #2

Runoff Path

Area of Concern

NID

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Runoff Path

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AOC #1

AOC #2

Runoff Path

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AOC #1

AOC #2

LR

x

Y

Runoff Path

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AOC #1

AOC #2

LR

Speed Profile-Ramp Entrance

Service Interchange

30 mph20 mph

Speed Profile-Mainline Exit

• Directional-50 mph minimum (applies to sharpest curve) Ramp with a design speed of 50 mph or greater on which vehicles do not stop.

Service Interchange

50 mph

60 mph

Questions?

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Contact Information:

tborchardt@getipass.com630-241-6800 Ext. 3850

jmartin@getipass.com630-241-6800 Ext. 3983

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